Tournaments
- Hastings International Chess Congress won by Frank Parr, 1939/40.
- Havana won by Isaac Kashdan ahead of Georges Koltanowski, January 1940.
- Beverwijk (the 3rd Hoogovenschaaktoernoi) won by Max Euwe, January 1940.
- Warsaw (a prison tournament), won by Moishe Lowtzky ahead of Stanisław Kohn, January/February 1940.
- Budapest (Maroczy Jubilaeum) won by Euwe followed by Milan Vidmar, Gedeon Barcza, etc.
- Amsterdam (VAS), won by Hans Kmoch followed by Adriaan de Groot, Salo Landau and Lodewijk Prins, etc.
- Amsterdam (VVGA), won by Euwe ahead of Prins.
- Baarn (Quadrangular), won by Landau ahead of Euwe and Kmoch, and Haije Kramer.
- Delft (Quadrangular), won by Kmoch followed by Euwe, Johannes van den Bosch, and Landau.
- Leeuwarden won jointly by Nicolaas Cortlever, Prins and Landau.
- Rotterdam won by Euwe ahead of Vlagsma.
- The Hague won by George Salto Fontein ahead of Arthur Wijnans.
- Ghent (the Belgian Chess Championship), won by Paul Devos.
- Santiago de Cuba won by Koltanowski ahead of Diez.
- Santiago de Chile (the Chilean Chess Championship), won by Mariano Castillo.
- Montevideo (the Uruguayan Chess Championship), won by Arturo Liebstein.
- Rio de Janeiro (Torneio Nacional de Selecao), won by Walter Cruz, February/March 1940.
- Buenos Aires (the 19th Argentine Chess Championship, Torneo Mayor) won by Aristide Gromer followed by Franciszek Sulik, Carlos Guimard, etc.
- Lvov (West Ukrainian championship), won by Abram Khavin, March 1940.
- Rosario won by Gideon Ståhlberg.
- Stockholm (unofficial Swedish Chess Championship), won by Nils Bergkvist.
- Randers (the Danish Chess Championship), won by Jens Enevoldsen.
- Güstrow won by Carl Ahues and Lachmann, start 20 March 1940.
- London (Easter) won by Harry Golombek and Paul List ahead of Vera Menchik-Stevenson, March 1940.
- New York (the 3rd U.S. Chess Championship), won by Samuel Reshevsky, 27 April – 19 May 1940.
- Bad Elster won by Karl Gilg and Ludwig Roedl, start 14 May 1940.
- Berlin won by Efim Bogoljubow ahead of Kurt Richter, start 16 June 1940.
- Berlin (the Berlin City Chess Championship), won by Rudolf Palme, June 1940.
- Posen won by Ahues and Elstner, July 1940.
- Nice (the French Chess Championship), won by Amédée Gibaud.
- Sofia (the Bulgarian Chess Championship), won by Oleg Neikirch and Alexander Tsvetkov.
- Dublin (the Irish Chess Championship), won by John O'Hanlon.
- Montreal (the 44th Canadian Chess Championship), won by Maurice Fox.
- Ventnor City won by Milton Hanauer and Sidney Bernstein.
- Dallas (the 41st U.S. Open), won by Reuben Fine ahead of Herman Steiner, August 1940.
- Bad Oeynhausen (the 7th German Chess Championship), won by Georg Kieninger ahead of Paul Felix Schmidt, start 4 August 1940.
- Rakovnik (the Bohemia and Moravia Chess Championship), won by Jan Foltys, 17–31 August 1940.
- Lvov won by Edward Gerstenfeld ahead of Izaak Appel, August 1940.
- Danzig won by Walter John ahead of Gustav Rogmann, September 1940.
- Leningrad (Quadrangular), won by Viacheslav Ragozin.
- Leningrad (the 15th Leningrad City Chess Championship) won by Ilya Rabinovich.
- Kiev (USSR championship, semi-final), won by Gerstenfeld and Stolberg.
- Moscow (the 12th USSR Chess Championship), won jointly by Igor Bondarevsky and Andor Lilienthal, followed by Vasily Smyslov, Paul Keres, Isaac Boleslavsky and Mikhail Botvinnik, etc., 5 September – 3 October 1940.
- Kiev (the 12th Ukrainian Chess Championship), won by Boleslavsky ahead of David Bronstein.
- Krakow/Krynica/Warsaw (the 1st General Government Chess Championship), won by Bogoljubow and Anton Kohler, 3–17 November 1940.
- Posen (Quadrangular), won by Rogmann.
- Prague (the Kautsky Memorial), won by Josef Dobiáš.
- Melbourne (the Pietzcker Christmas Tournament), won by Lazare Suchowolski, December 1940.
- Sydney (the New South Wales championship), won by Lajos Steiner followed by Gary Koshnitsky, Cecil Purdy, etc., 1940/41.
Read more about this topic: 1940 In Chess